| Date | Fri, 30 Jul 2021 15:50:17 +0200 | From | Thomas Gleixner <> | Subject | [patch 10/63] rtmutex: Switch to try_cmpxchg() |
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From: Thomas Gleixner <tglx@linutronix.de>
Allows the compiler to generate better code depending on the architecture.
Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- kernel/locking/rtmutex.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -145,14 +145,14 @@ static __always_inline bool rt_mutex_cmp struct task_struct *old, struct task_struct *new) { - return cmpxchg_acquire(&lock->owner, old, new) == old; + return try_cmpxchg_acquire(&lock->owner, &old, new); } static __always_inline bool rt_mutex_cmpxchg_release(struct rt_mutex *lock, struct task_struct *old, struct task_struct *new) { - return cmpxchg_release(&lock->owner, old, new) == old; + return try_cmpxchg_release(&lock->owner, &old, new); } /*
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